Add Display to CloseFrame and CloseCode

Signed-off-by: Alexey Galakhov <agalakhov@snapview.de>

src/protocol/frame/coding.rs

@@ -193,9 +193,16 @@ impl CloseCode {
     }
 }
 
-impl Into<u16> for CloseCode {
+impl fmt::Display for CloseCode {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let code: u16 = self.into();
+        write!(f, "{}", code)
+    }
+}
+
+impl<'t> Into<u16> for &'t CloseCode {
     fn into(self) -> u16 {
-        match self {
+        match *self {
            Normal         =>  1000,
            Away           =>  1001,
            Protocol       =>  1002,
@@ -218,6 +225,12 @@ impl Into<u16> for CloseCode {
     }
 }
 
+impl Into<u16> for CloseCode {
+    fn into(self) -> u16 {
+        (&self).into()
+    }
+}
+
 impl From<u16> for CloseCode {
     fn from(code: u16) -> CloseCode {
         match code {

src/protocol/frame/frame.rs

@@ -35,6 +35,22 @@ pub struct CloseFrame<'t> {
     pub reason: Cow<'t, str>,
 }
 
+impl<'t> CloseFrame<'t> {
+    /// Convert into a owned string.
+    pub fn into_owned(self) -> CloseFrame<'static> {
+        CloseFrame {
+            code: self.code,
+            reason: self.reason.into_owned().into(),
+        }
+    }
+}
+
+impl<'t> fmt::Display for CloseFrame<'t> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{} ({})", self.reason, self.code)
+    }
+}
+
 /// A struct representing a WebSocket frame.
 #[derive(Debug, Clone)]
 pub struct Frame {